Joule Thief

[crowclaw]

I think i start to get it. The larger the farad for each caps, the lower the voltage rite? So tats why u recommend me to use larger caps since it require less voltage to fully charge it.. Plz correct me if i am wrong.. thanks 

Charging capacitors is not that easy at first to try and understand... so don't worry.
Lets look at it this way, your JT outputs a certain voltage and current delivery capability. Lets say its a constant slow drip... drip...drip, if you place an egg cup under the drip it will take X time to fill up. As long as the drip is constant it will take the same amount of time to fill... OK. if you tip the egg cup, the contents will spill out and empty quite quickly. Look upon your egg cup then as a small capacitor of small value. Next repeat the same experiment but instead of your egg cup use a larger vessel say a large bowl. The drip remains at the same fill rate as before, but now the bowl takes a lot longer to fill up, like wise if you allow it to empty at the same rate as the egg cup it takes a lot longer to empty due to its volume (capacity) of water, but you also have a greater volume of water to use and do more work with. All capacitors charge and discharge at a rate determined by what is known as the time constant measured in seconds = the product of the circuits resistance (ohm's) and the circuit capacitance (farads)
t =RC. I hope my simple analogy goes towards a better understanding. Note of course we are dealing with a JT circuit and have to understand that the JT produces spikes of pulsed DC and as Bill has discovered additional pulsed energy which has further increase the voltage charge on his EB cap's. If you are not familiar with Ohm's Law or time constant RC circuits, take a little time to search the web I'm sure you will appreciate a better understanding and will help you move forward in this fascinating thread.  Merv

[gadgetmall]

Yes the Jt is Interesting and gave me a Boost seeing the forum still has eager beavers wanting to make light and stuff . This  has probably been done before by many people but i thru it together without knowing what i was doing again . what i will never understand is why it always shows some gain . the next step in this little circuit is see if it can be hooked up to maybe a scope and see the difference that i see with multimeter s and my eyes .
http://www.youtube.com/watch?v=wOnAtvn4kts

Gadget 

[gadgetmall]

Here i have my fuji circuit.. so i have remove the caps.. but get stuck with resistor.. which resistor i should remove? and how i supposed to connect those cfl to this circuit?

Its seem like my fuji circuit is different from http://josepino.com/circuits/fluorescent_light

by the way, that red and black wire is for the suis.. am i connecting it rite?

HI . remove the red and black wire . not needed . also you cut the correct diode but you need to jump it with a piece of wire . this along with the  the trigger transformer ( the one in front of the diode )can be removed . then one more thing is a resistor that is between the trigger transformer and a silver Hv capacitor . this is where you put a variable resistor in place of that resistor . you should light a cfl easy if you do these modifications to that aaa fugi . The CFL tube must be removed from the screwin electronics if you are using a spiral cfl . Or use a florescent tube and the connections are where the high voltage capacitor were . this is your output . it is HOT so be careful and dont kill yourself 
Gadget

[Mk1]

@gadget

Hi gadget , glad to see you feeling better , i was wondering if you had a chance to see this video i made , i light leds from the battery leads ... ,the radiant high freq returns to the battery maybe a diode could recharge the battery , this was a dual joule thief one PNP and one NPN  one core each but once everything is working i change the connections so the base coil of each transistor is on the opposite core .
I did this to sync both circuits , the output from the transistor it self is around 120 volts and got 2 of those phase reversed .

http://www.youtube.com/user/abramrk1#p/u/4/cJsz2Kd4R7o

it starts about half way .

The coil is my t-paper coil small one connected to 3 White led it need about 4 volts to light those ,  it doesn't use avarmenko plugs , you know leds are diodes avramenko 2 diodes one led or 3 led ...

Mark


Edit Btw good work the video is a bit hard to see , i bit more light would have helped the camera , but the work is great as usual !

[j037m]

hi all im new here on posting message on jt thread just like to say been reading so many post here about jt and also asking some question( on message) on bro mark which help me alot and bro bill  and  sis jeanna i also made my first jt work and now making something like bro mark did on 1'' toroid  and sis jeanna's light i also finish my fuji camera circuit and work well by following some post of bro bill .. as soon i make some picture on it or video ill post all my finish project ... thanks a lot this thread helps a lot..


;)joey